Linux Kernel fine-tuning experience

Linux Kernel fine-tuning experience-general Linux technology-Linux programming and kernel information. See the following for details. Because it is Slackware, we take the 2.4 kernel as an example.

1. The cursor in the text console:
Linux uses a blinking cursor by default. Some friends may not get used to it (I miss SOFTCURSOR in BSD ). Although the Documentation/VGA-softcursor.txt provides a way to change in shell, for example,
We can use echo-e '\ 033 [? 81; 0; 112c 'But I personally don't think it is so uncomfortable. It is best not to flash when the kernel is started.

You only need to change the default value of CUR_DEFAULT in include/linux/console_struct.h to 0x7051. (This value is available for testing on my machine)
# Define CUR_DEFAULT 0x7051

2. Speaker tone:
The default value is defined in drivers/char/console. c. It can be changed as per your preferences. For example:
# Define DEFAULT_BELL_PITCH 550
# Define DEFAULT_BELL_DURATION 100

3. No shutdown problem:
Sometimes, after re-compiling the kernel, it is found that even if APM and ACPI are selected during Kernel configuration, the halt command cannot be shut down (but the hard disk is switched off ). Pay attention to the local APIC option. If your motherboard does not support local APIC, you must turn it off. Additionally, the SMP option will automatically enable local APIC. If SMP is selected, the local APIC option does not appear. You must disable SMP before you can see it.

The local APIC online help mentioned that the server cannot be shut down, but the configuration in the linux official package uses SMP by default. The Slackware kernel does not use local APIC, so there is no such problem. If you compile the kernel, you can consider this cause.